Math art by Daniel E. Weeks
To use these, you'll need a reasonably large display and a keyboard.
These are not mobile-friendly.
Harmonograph
Hearts
Triangles
Triangles II
Triangles III
Grid art
Grid art II
Grid art III
Grid art IV
Modular math
Modular math II
Clifford attractor
de Jong attractor
Fractal dream attractor
Svensson attractor
Gumowski-Mira attractor
Bedhead attractor
Hopalong attractor
Symmetric icon attractor
Spirals